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Lift over foils
Wayne.B wrote in message ... On Thu, 1 Apr 2004 10:33:19 +0100, "JimB" wrote: I'm not proposing that the air 'has to catch up'. I'm just saying that if it loses pressure, it's got to gain speed (or disperse energy in some other way). ================================== Let's try for an intuitive approach using a flat plate (your hand, for example). Imagine sticking your hand out the window of a moving car and "flying" it through the air as most of us have probably done as a kid until our parents yelled at us. If you hand is more or less parallel to the ground, you have wind resistance (drag), but no lift. Tilt you hand slightly upwards and now the wind strikes the bottom of your palm and forces it upwards (lift). The reason lift is created is that your hand is deflecting molecules of air downwards (change in momentum), and the resultant force is upwards. It's simple Newtonian mechanics. It's OK Wayne. I understand the dynamics of lift reasonably well. I'm trolling to check that Jax also understands it. JimB |
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